I shouldn't be bad, although I didn't actually measure its heap usage. Allocating memory and copying data is slow, so in LLD we mmap input object files and use

I shouldn't be bad, although I didn't actually measure its heap usage. Allocating memory and copying data is slow, so in LLD we mmap input object files and use the files directly as much as possible. This increases process virtual memory size (because large files are kept mapped to memory), but the actual memory usage is much smaller than that.